SYNTHESIS AND CHARACTERIZATION OF ACRYLIC TRIBLOCK POLYMERS
丙烯酸系三元嵌段共聚物的合成与表征

Living" anionic and cationic polymerization techniques are usually used for controlled block polymerization of vinyl monomers.A fundamentally new method with several advantages over the existing processed was reported in 1983 for the polymerization of acrylic monomers-group transfer polymerization(GTP).It's a new insertion polymerization technique.In this paper,a series of triblock polymers with methacrylate,acrylatc and acrylonitrile segments was synthesized at room temperature via GTP.The polymerization is initiated using dimethyl ketene methyl trimethylsilyl acetal(MTS)in the presence of a nucleophilic catalyst Bu4NH(PhCO2)2.During the preparation, the monomer addition order and timing must be controlled in the order of methacrylate, acrylate and acrylonitrile.The products were characterized by 1H-NMR, FT-IR and GPC.The copolymerization mechanism is also discussed.